Steam-turbine-cylinder lining.



Patented Fab. 2.2, 1910.

E'. HODGKINSON.

STEAM TUBBINB CYLINDER 1.1mm

APPLICATION FILED 51332.12, 1908.

fllsllnl-l... I l l l l l||l lllllllllll l s' INVENTOR.

Y -15W Qu-'A TTORNEY 1N hier.

IVI

j bladesandintcrnualiate1an-ingpieresina-:I- K mental blade rings. andprovidingy tneatr` l'or securingr the blade rings and also a pro-.ings,ol` which the 'followingis a specification,

Unrrnn STATES Piz-tireur opteren.

FRANCIS HODGKINSON, OF EDGEYVOGD PAT-.KA PENNSYLVATCIA. ASSIGNOR TO THEWESTINGHOUSE MACHINE COMPANY. .A CORPORATICN PENNSYLVANIA.

i or STEAM-TURB'INE-CYLINDER LINING.

950,330. Specification of Letters Patent.

Application filed June 12, 1968.

aten ted 'Feb serial No. 438.166.

To all :tf/tom iz' may com-wn:

Be it known that l, l"u.\ \f:1s llonoatxsolv. a Asubject ot' the King`ot' Great Britain and ireland, and a resident ot' Edgewood tark, in thecounty ot' Allegheny and tritate of l tion along 'the line ot' Fig. 1.lennsvlvaniin have made a new and useful a plan view of a rotating4blade-caraving elelnvention in Steam-Turbine-Lyiinller Linwenn to whichblades are .secured in accordance with my invention; Fig'. l is a trans-This invention relates to tilading i'or elas- .ver. e ,section of afragment of a stationaryY tie. tluid turbines, and also to meanslor .seiblatltr-carrying element ,embodying my inenring :t protective coveringyto the bladei ventina; and. Fig. 5 is a perspetive view ot' ero-vying.glement of the turbine, i a spacing piece, which forms a detail oi' my.tu object ol this invention the produc- Y ixneution. tion ol simple andeli'ective means for hhtdbladecarryin.;r element 3 o the turbine meturbines' in conjunction with means for i is provided with a pluralityot' hla-de-iitotint eti'cetiiely securing a protective covering foring,r slots i'. in which blades b and intermethe blade-catryingr elementin place on the i diate spacinvhff pieces St are assembled. llaehelement. blade is provided, near its base, with a hole X further objet-ti ttnprotluctitui or" simi 10. which extends transverseliv through it,ple and et'ective means l'or assembling the and @zich piece J iSprovided with a hoie il, blades in segmental strips and ior renderingwhich extends transversely through it and the operation ot' renewingrblades in a turbine a simple matter.

The inner }.\etipheral fat-e of the :tatiolb ary ele-nient or casing ot'the turbine is req'jently corroded and pitted by the motive tluid of theturbine. 'the pitting of the caseation and forming' a part thereof:Figure l is a t1'::j }tnent'al section ot' a rotor orrotatingblade-carrymgr element` and discloses an elnregister with a holeof an adjacent blade 8 when the blades and pieces are assembled iu ablade mounting slot.

The blades 8 and the spacing pieces t) are, before the)Av are introducedinto the bladeiug. and, in souleinstaxafes. ot' therotating carryingslot, assembled into segmental blmle-carrying element, results from anblade rings or sections by beingr threaded erosive and corrosive actionwhich may he onto and Secured in place on a binding` wire the result ofchemical impurities in the t2, which is adapted t0 extend through theboiler feed water, sut-iu for instance. as orholes 10 and 11 of theblades and pir-ce` rl ganir or inorganic acids. 1t may resultspeetif'ely. The blades and pieces. are alterfrom the corrosive actionof the distilled nately arranged upon the wire and, if dewater, that is,the water of condensation, and the erosive action of the motive fluidand the water of condensation in their pas- Sage through the working:rpassages of the turbine. Whatever the cause, the fact remains that theexposed surfacesof the wot-lt4 in;r elements are at time andamici-.certain conditions badly pitted and corroded... The east ironcasini;r is usually more actively` ati tacked than the rotor element.but l con-i template providing' a protective covering` which mav bee'eeerivelv seem-ed to both the ing :if the outer or free ends of theblades. sialiot-tartz and rotaline' hirule-'-art' ving elei and throughwhich ifie. tips lil of the bladl mentsof-a turbine, I are adapted toextend. Alter the channel is This invention contemplates assembling; lin place on the blades it is permanently Se- E cure-l to them b vriveting over eat-h tip i3. This construction in conjunction with thebinding wire 12 permanentln'r assembles the tective covering for theblade-carrying ele. blades and spacing pieces into a segmental ment tothat element. t ring.

In the drawings accompanying this appli- One wall of each blade-mountingslot 7 over to permanently secute them iu place. i Any suitable methodmay' be employed .for t assembling' the blades and pieces onihe wire.The. outer or free. ends of the blades are xach provided with a tip 13,whieh extends 4longitudinali` of the blade and which is adapted tosecure a channel il onto the outer end of the blade. The channel l-t prtvided, in its web portion, with holes; lf

which is so Vlocated within the piet-e as to sit-ed, the ends of eachwire may be riveted i which are spaced to correspond to thesparbodiiucnt of m v invention; Fie'. 2 is a seth i same side of theinclined face 1G. The lug 17 is so located on each piece 9 as to projecti beyond the walls 'o the slot and to overhang the undercut Wall of theslot when the pieces are located in place in a slot. The other lateralface 18 of each piece extends at right angles to the top and bottomfaces of the ieee and, when the pieces are located in a i slet 7, isnormal to the peripheral 'face of the blademounting slot. After theblades and spacing pieces have i, been assembled into a segmental ring,the'i ring segments are introduced into the blademounting slots 7 insuch a Way that the ini t at or near the top of each piece and on the ti elined lateral face of each ring, formed by the. inclined faces 1G ofthe intermediate pieces 9, comprised in each segmental ring, contactswith the undercut wall of the mounting slot. The rings are then securedin place in the lade-mounting slotby means of aealking strip 20, whichis inserted in the slot between the faces 1S of the intermediate piecesE 9 and the vertical Wall of the slot. E Protective strips 9,1 arelocated between adjacent blade-niounting slots 'i' and are secured inplace on the blade-carrying element by means of the lugs 17 of thespacing pieces 9 located in one slot and the calking piece 20 located inthe nett adjacent slot.

The method of mounting the protective cated in the blade-mounting:r slotand is per- .ne nently secured in place in the slot by means of aeallting piece 2O which is calked into the slot and thereby forced intogripping contact with the vertical wall o the slot and which forces theinclined face oft the blade ring into gripping contact and' positiveengagement with the undercut wall i of the slot. A blade ring is thenintroduced t into the next adjacent slot and a protective strip 21 is solocated between the tivo adjacent. slots that one edge contacts with andis overhnnc by the lugs 17 of'the spacing:r pieces 9 secured into thetirst mentioned slot. i These spacing pieces are of such height thatthey project beyond the walls of thebladecarrying slots :in amount whichis about equal to the thickness of the protective i, strips 2l, and theprotective strips are beveled ateach edge. `Each calking piece Q0 is soconstructed that when calked into the i l strips is as follows: One rowef blades is lol, i

l l i -blademounting slot, it will tion' around and str1 p 21. Thisconstruction secures the protective strips rigidly 1n place and preventsthem from being dislodged by centrifugal i. l. i l engagethe adjacentedge of the protective i l. or any other dislodging force The pro-ltective strips are curved to correspond to the curvature of theperipheral face of the blade-carrying element and they are preferabltcut into sections for convenience in handling and mounting them on thebladecarrying element. Each section of a ring is so arranged at its endsthat the sections may be inserted into the blade-mounting slotend forend without destroying the spacing of the blades in one annular row. Itwill be apparent that for convenience in handling, the calking pieces 2Umay aise be introduced into the slots in short sections. Throughout thisspecieation and in the claims, I h ve utilized the terms blade andblades in their broadest sense; that is, to mean either the moving orstationary blades ofra turbine` The term blade-earrying eleneent hasalso been utilized in the broad sense, and means wherever it occurseither the stationary or rotating blade or bucket-carrying element of aturbine. I. therefore, wish it to be understood that I do not limit thescope of this invention to either a stationary or moving blade-carryingelement of a turbine, and that the speciieation 1s broad enough to`include various and different kinds of blades and buckets.

En accordance with the provisions of the patent statutes, I havedeseribedsthe prineiple of my invention together ivitii the apparatuswhich I now consider the best embodiment thereof, but I desire to haveit understood that the apparatus shown is only illustrative and that theinvention can he carried out by other means.

That I claim is: s

I. In combination in a turbinc,.a bladecarryingelernent provided `With aslot, a segmental blade-ring comprising blades, intermediate spacingpieces, and means for securing said blades and said pieces to gether, aprotective covering for said cle ment and a calkiug' strip for securi gsaid covering and said blade ring to said clement.

n. In combination in a turbine, a blade carryinil element provided witha plurality of slots, blades and intermediate spacing pieces located insaid slots, protective strips between adjacent slots` means formedintegrally with cach spacing piece for engaging a protective strip, anda callting strip for securing said blades and said spacing stripsintosaid slots and said protective strips to said element.

In testimony whereof, I have hereunto subscribed my name this ith day o?June, 19W.

FRANCIS HODGIINSON.

Witnesses:

CHARLES W. MCGHEE, E. W. McCALmsrnn.

